1、Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of water O vapour transmission properties The European Standard EN 1931:2O has the status of a Brihh Standard ICs 75.140; 83.140.10; 91.100.50 BS EN 1931:2000 Incorating Gowigendurn No. 1 NO
2、 COPYING WITBOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW O BS EN 1931:2000 13231 comgendum No. 1 National foreword 17 September Mx)1 This British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authori
3、ty of the Standards Committee and comes into effect on 15 September 2000 O BSI 17 September 2001 ISBN O 580 36356 2 This British Standard is the official English language version of EN 1931:2000, including corrigendum February 2001. The UK participation in its preparation was entrusted by Technical
4、Committee B/546, Flexible sheets for waterproofing, to Subcommittee B/546/1, Bituminous roofing felts, which has the responsibility to: - aid enquires to undemtand the te* - present to the responsible European committee any enquiries on the interpretation, or proposais for change, and keep the UK in
5、terests informed; - monitor related intedonal and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications r
6、eferred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail the necessary provisions of
7、 a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an ins
8、ide back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. O Amendments issued since publication I Date Amd. No. Comments Correction to EN foreword EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1931 July 2000 ICs 91.100.50
9、 Incorporating corrigendum February 2001 English version Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of water vapour transmission properties Feuilles souples dtanchit - Feuilles dtanchit de toiture bitumineuses, plastiques et lastomre
10、s - Dtermination des proprits de transmission de la vapeur deau Abdichtungsbahnen - Bitumen-, Kunststoff- und Elastomerbahnen fr Dachabdichtungen - Bestimmung der Wasserdampfdurchlssigkeit This European Standard was approved by CEN on 10 June 2000. CEN members are bound to comply with the CENICENELE
11、C Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN
12、 member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN me
13、mbers are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALI
14、SATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassatt, 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1931:2000 E Page 2 EN 1931 :200O Contents o O O BSI 17 September 2001 Page 3 EN
15、1931:2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 254, Flexible sheets for waterproofing, the Secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorse
16、ment, at the latest by January 2001, and conflicting national standards shall be withdrawn at the latest by July 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cz
17、ech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. O O BSI 17 September 2001 Page 4 EN 1931 :2000 Introduction This European Standard has been prepared by the Technical Commit
18、tee CENKC 254 to determine the water vapour transmission properties of flexible sheets for waterproofing. This standard has been prepared for applications in roofing but it may also be used in other areas where it is relevant. This standard is intended for characterization of flexible sheets for wat
19、erproofing as manufactured or supplied before use. This standard relates exclusively to products and not to waterproofing membrane systems composed of such products and installed in the works. 1 Scope This European Standard specifies a method for the determination of the water vapour transmission pr
20、operties and for the calculation of the density of moisture flow rate g and of the moisture resistance factor p of waterproofing sheets. It is applicable to factory made bitumen, plastic and rubber sheets for roof waterproofing. 2 Normative references This European Standard incorporates by dated or
21、undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of these publications apply to this draft European Standard only wh
22、en incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prEN 1341 6:1998, Flexible sheets for Waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Rules for sampling EN 12591, Bitumen and bituminous bind
23、ers - Specifications of paving grade bitumen O BSI 17 September 2001 Page 5 EN 1931:2000 03 Definitions For the purpose of this standard, the following definitions apply. 3.1 Density of moisture flow rate: The mass of water vapour transmitted through a unit area of the sheet of specified thickness i
24、n a unit time under specified conditions of temperature and humidity, quantity defined by the following relation: Am g=- AxAt where A is the exposed area of the test specimen in m2 and At is the time interval between two corresponding weighings of the test assembly in s. 3.2 Moisture permeance: Quan
25、tity defined by the following relation: O 9 wp = (Pl - P2) where pi and p2 are ambient partial vapour pressures at the two faces of the specimen during the test. 3.3 Moisture permeability: Quantity defined by the following relation: Sp = w, xd where d is the thickness of the test specimen in m. 3.4
26、Moisture resistance factor: Quantity defined by the following relation: where Arna is the moisture conductivity of air and may be calculated as given under 9.1. 3.5 defined by the following relation: Water vapour diffusion-equivalent air layer thickness: Quantity where d is the thickness of the test
27、 specimen in m. iymbol g wP 6, P ma Sd Unit kg/(m2.s) kg/(m2.s .Pa) kg/(m .s.Pa) kg/(m.s.Pa) m O BSI 17 September 2001 Page 6 EN 1931:2000 4 Principle The test specimen is sealed to the open flange of a test cup containing a desiccant. The assembly is then placed in an atmosphere with a controlled t
28、emperature and humidity. When mass take-up is linear over a period of time, the assembly is weighed periodically to determine the density of moisture flow rate through the test specimen into the desiccant. Due to the nature of the bitumen, plastic or rubber sheets concerned, the test procedure given
29、 in this standard consists of two methods: 4.1 Method A: test procedure for bitumen sheets. 4.2 Method B: test procedure for plastic or rubber sheets. The technical content of the standard is, where relevant, adapted to these parts accordingly (e.g. clause 6, Preparation of test specimens). 5 Appara
30、tus 5.1 Cups (Absorption atmosphere) Use cups of pure, cold drawn aluminium of 1 mm thickness, which guarantee a free test area of 0,005 mZ , total weight of specimen-mounted cup and desiccant must not exceed capability of the analytical balance used (accuracy *0,1 mg), as represented in figure 1. D
31、imensions in millimetres 2 1 Test specimen 2 Desiccant Figure 1 - Aluminium cup with absorption atmosphere 5.2 Mechanical gauge to determine the thickness d of specimen to the nearest 0,051 mm. 5.3 f0,I mg. Analytical balance, capable of weighing the specimen-mounted cup (5.1) with an accuracy of 5.
32、4 Constant-temperature, constant-humidity chamber capable of maintaining a relative humidity of (75 f 2) % and a temperature of (23 f 1) OC. Alternatively, use a room or chamber that can be maintained at (23 f 1) “C together with a desiccator containing a sodium chloride solution, saturated at 23 “C
33、 and containing a large excess of undissolved sodium chloride. The relative humidity at the upper test specimen surface must be kept constant during test. An air movement of 0,02 m/s to 0,3 m/s in the vaporizing atmosphere shall be produced by a propeller. O O BSI 17 September 2001 Page 7 EN 1931:20
34、00 Dimensions in millimetres c 4 3 1 2 3 side view of the propeller with blades saturated salt solution with remaining solid at the bottom 125 holes 0 8 per plate Figure 2 - Evaporation atmosphere (example of installation; shown without cups) 5.5 Desiccator: for the transfer of test specimens. 5.6 D
35、esiccant: Anhydrous calcium chloride with particles size of about 5 mm in diameter, free of fines that will pass a 600 pm sieve. The relative humidity in the cup atmosphere shall not exceed 1 %. During the test period the total mass increase of desiccant shall not be greater than 13 g per 25 cm3. 5.
36、7 Sealant: Sealing compound to create a vapour tight seal between the specimen and the cup (absorption atmosphere), e.g. extruded sealant, type Butyl or Polyisobutylene or bituminous binder, paving grade bitumen 35/50 according to EN 12591. O BSI 17 September 2001 Page 8 EN 1931:2000 I 1 2 3 1 Inner
37、 template 2 Sealing compound 3 Test specimen 4 Cup according to picture 1 Figure 3 - One arrangement for sealing 5.8 Template or sizing form: auxiliary device for the sealing procedure. If used during sealing procedure only, doutside = (79,8 f 0,4) mm. If used also during test procedure, dinside = (
38、79,8 f 0,4) mm. 5.9 Barometer: capable of measuring barometric pressure with an accuracy of I1 hPa. 6 Sampling Test samples shall be taken in accordance with prEN 13416:1998. 7 Preparation of test specimens 7.1 Procedure of sampling e Test specimens shall be taken evenly across the width of the shee
39、t, the outer ones 100 mm away from the edges. , 7.2 Number of test specimens I At least three test specimens and one reference specimen shall be taken. 1 7.3 Dimensions of the test specimens i Circular test specimens, which are adjusted to the dimensions of the cup (d - 90 mm). The specified free su
40、rface of test specimen of 0,005 mz is equivalent to d = 79,8 mm. 7.4 Conditioning of test specimens 7.4.1 Method A Store the test specimens mounted on the cup for at least 90 days at 23 “C I75 % R.H. before weighing the first time to the nearest 0,l mg. 7.4.2 Method B After the test specimens are mo
41、unted on the cup, weigh the assembly to the nearest 0,l mg and then store at 23 “C / 75 % R.H. in the test chamber. O BSI 17 September 2001 Page 9 EN 1931 :2000 Proced Ure a8 - 8.1 Test conditions Climatic chamber or evaporation area: Convection: 0,02 to 0,3 m/s Closed absorption area of cup: 8.2 Pr
42、ocedure (23 f 1) “C / (75 f2) % R.H. (23 f 1) OC / (O + 1) % R.H. Place a layer of desiccant (5.6) of approximately 12 mm thickness on the bottom of the cup (5.1). Leave a space of 3 mm to 4 mm between desiccant and specimen. Seal the test specimen in the cup and weigh to the nearest 0,l mg. Place t
43、he cup in a constant-temperature, constant-humidity chamber (5.4) maintained at (23 f 1) OC and (75 f 2) % relative humidity. Alternatively place the cup in a desiccator containing the sodium chloride solution and place in a room or chamber maintained at a temperature of (23 f 1) “C. Seal one test s
44、pecimen in the cup without desiccant as a reference specimen and handle in the same way as the test specimens during the test procedure. For waterproofing sheets with a density of moisture flow rate anticipated to be less than 1,157 4 x lo- kg/(m2.s), at intervals of one week, quickly remove the cup
45、 from the chamber (5.4) and store it in the test specimen transfer desiccator (5.5) at room temperature for (30 f 10) min; then weigh the cup to the nearest 0,l mg. After weighing, shake the cup to mix the desiccant, then return the cup to the chamber. a NOTE: It is not necessary to place the cup in
46、 the transfer desiccator (5.5) if conditioning and testing are conducted in the same constant temperature and humidity rooms. Plot the measured mass against time at weekly intervals and terminate the test when four consecutive points, excluding the initial weighing, lie on a straight line with a dev
47、iation of at most 5 %. Having a variation in barometric pressure the cup may act as an “air ship“ caused by buoyancy. For materials with a low density of moisture flow rate .e. lower than g = 5,787 O x I O- kg/(mz.s) it is necessary to perform weighings on the days with a similar barometric pressure
48、 (15 hPa). This is the best way to take account of the buoyancy effect caused by large day to day pressure variations. 9 Expression of results and precision of test method 9.1 Expression of results a Taking the reference into account beforehand, calculate the density of moisture flow rate, g , for e
49、very test specimen using the following equation. g=- Am21 AxAt rn21 where: is the rate of mass change determined from the endpoints of the straight line graph in kg; ml)-(mRZ mR1) where: m2, ml mR2, mR1 : is the mass of the reference assembly, in kg; A At is the mass of the test assembly, in kg; is the exposed area of the test specimen, in m2; is the time interval between two corresponding weighings of the test assembly in s. The mean value and the standard deviation of the density of moisture flow rate, g, for the three test specimens shall be calculated. O BSI
